Cream the butter, sunflower oil, egg, sugar and vanilla using a mixer. Add the milk, flour, nutmeg, baking powder and salt. Continue to mix for a few minutes. Pour evenly into greased large muffin-pan cups.

Bake on the middle rack for 20-25 minutes or until firm. Spread the butter on the tops while they are still warm and sprinkle some sugar and cinnamon.